Metal cement



fi med Feb. 17, 1931 v 1,793,157

WILLIAM R CHAPIN, OF INDIANAPOLIS, INDIANA METAL CEMENT Drawing.Application filed January 4, 1930. Serial No. 418,661.

1 This invention relates to a cement for joinand the surfaces to bejoined are tightly metals and more particularly for joinpressed togetherto remove any surplus coming steel, such for example as high speedpound. They are then allowed to cool under steel, tungsten carblde andother metals and pressure until such time as the cement has set conslstsof a compound which by long experiin the joint and then removed from thepres- 5; mentrng and considerable use has been found sure and if desiredare quenched, the temperato be part cularly adapted for securing a turebeing drawn afterwards to suit the work. perfect union of the metalswhere a high It will be obvious to those skilled in the art speed steel1s oined to a tougher steel back that various changes may be made in myor shank product without departing from the spirit of An o b1ect of theinvention is to provide a the invention, and I, therefore do not limit,tpmentmg compound WlllCh will not only join myself to those proportionsnamed in the mew securely together but which will show specification,but only as set forth in the apadarlcely any trace of the joints. pendedclaims.

7 EOIltlllS cementI preferably use a mixture Having thus fully describedmy'said in- Q5 oon'tmning fine steel filings, powdered borax vention,what I claim as new and desire to slllco manganese and powdered copper.secure by Letters Patent, is:

In preparing the compound these elements 1. A cementing compoundconsisting of e reduced to finely divided powdered form, approximately40% silico manganese, ap-

I en thoroughlymlxed to provide a perfectly proximately 25% powderedcopper, between 70 uniform mixture of the elements. While not 1% andpowdered borax glass, and the restricting myself to any specificproportions remainder fine steel filings, substantially as Inevertheless have found the following perset forth.

res 111 a h r ughly satisfactory 2. A cementing compound consisting of a:pompound, namely, fine steel fil1ngs,10 mixture of approximately silicomanpowdered borax glass, 25% powdered copper, ganese, 25% powderedcopper; 10% powdered H $11160 m ng n s mixture borax glass, and 25%steel filin s, substanr'esultsjn a cement particularly adapted fortially as set forth. a ,rementing tungsten carbide and other metals Inwitness whereof, I have hereunto set my {tea steel shank. hand atIndianapolis, Indiana this 2nd day p The process of cementing 1s asfollows: of January, A. D. nineteen hundred and The arts to be wiped ar;coverefii with a laythirty.

, ero approximate 0 an inc of the com- WILLIAM R.

pound; the ends re then placed together CHAPIN' 1nd held together, andheated to temperas tal-es suitable to the particular metals which are tobe joined. For high speed steel I have found the best temperature to beabout 2300 to 2350 degrees F.; for tungsten carbide the cementingtemperature ranges'between 217 5 02250" F.; for stellite the temperaturemay between 2200 and 2250 F.; other steels may have a temperature rangesomewhat difintent. Where large pieces are to be cemented they may firstbe placed in a preheating cham- A, which is maintained at a temperaturebelow the cementing temperature, generally 'at a temperature between1500 and 1600 F.

r After the metals are subject to the high temperatures they are removedfrom the heat I

